Are you using the same FTP server in both your tests. Is it exactly 40kb/s or does it fluctuate? If its exactly, it sounds like the FTP server could be throttling the connection, or some LAN management software on the FTP server.
It is possible you have an oversubscription issue if you have numerous servers on the same card , you might try moving the server port to a different card and see what happens . CPU has very little to do with transfer rates as most traffic is switched in hardware and never sees the CPU on the MSFC .
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...